Solutions by everydaycalculation.com
18 - 27 is -956.
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Related: 2/8-2/7 1/8-4/7 1/16-2/7 1/8-2/14 3/8-2/7 1/8-6/7 1/24-2/7 1/8-2/21 5/8-2/7 1/8-10/7 1/40-2/7 1/8-2/35 7/8-2/7 1/8-14/7 1/56-2/7 1/8-2/49
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